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Study of graphene-based high frequency optoelectronic devices for optoelectronic mixing

Abstract : Since the first experiment performed in 2004 by Andrej Geim et Konstantin Novosëlov, graphene has been extensively studied in the field of photonics and optoelectronics. Its extraordinary properties include very high charge carrier mobility and light absorption in a wide spectrum of wavelengths, including the telecommunication wavelength (1.55 μm). This properties make this material very appealing for the realization of optoelectronic devices used in RADAR and telecommunications. Moreover, since graphene can be integrated the standard silicon technological platform, it has the potential to substitute III-V materials. The application domain of graphene-based devices and components has considerably grown during the last years. Nevertheless, since the key parameters impacting the performances of graphene-based optoelectronic devices are still not properly controlled, the number of applications at the industrial scale remains very limited. In this thesis work, optoelectronic mixing, a very used function in RADAR and telecommunication systems, is demonstrated by using graphene-based devices. First, we performed a statistical study of charge carrier mobility, residual doping and contact resistance. This study allowed to identify the best technological process and the best characterization methods (choice of the test devices and of the parameters extraction methods). By using this optimized procedure, we realized the first demonstration of a high frequency optoelectronic mixer based on graphene. Then, an in-depth study of several RF devices with different geometries allowed to identify the best operation conditions and the best design. Using the designed coplanar waveguides as well as an alternative method relying on high frequency based RF transistors, the optoelectronic mixing in graphene has been demonstrated up to 67 GHz. The majority of this work has been conducted using statistical methods. To do so, I implemented a automatized experimental set-up which enabled the study of a considerable number of devices. This approach has proven to be essential for controlling and optimizing the technological process in the perspective of an industrial development.
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Alberto Montanaro. Study of graphene-based high frequency optoelectronic devices for optoelectronic mixing. Physics [physics]. Université Paris sciences et lettres, 2019. English. ⟨NNT : 2019PSLEE028⟩. ⟨tel-02614339⟩

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